3257643 has 4 divisors (see below), whose sum is σ = 4343528. Its totient is φ = 2171760.

The previous prime is 3257641. The next prime is 3257663. The reversal of 3257643 is 3467523.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3467523 = 3 ⋅1155841.

It is not a de Polignac number, because 3257643 - 2¹ = 3257641 is a prime.

It is a super-2 number, since 2×3257643² = 21224475830898, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3257643.

It is not an unprimeable number, because it can be changed into a prime (3257641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542938 + ... + 542943.

It is an arithmetic number, because the mean of its divisors is an integer number (1085882).

Almost surely, 2^3257643 is an apocalyptic number.

3257643 is a deficient number, since it is larger than the sum of its proper divisors (1085885).

3257643 is a wasteful number, since it uses less digits than its factorization.

3257643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085884.

The product of its digits is 15120, while the sum is 30.

The square root of 3257643 is about 1804.8941797236. The cubic root of 3257643 is about 148.2408271707.

It can be divided in two parts, 32 and 57643, that added together give a palindrome (57675).

The spelling of 3257643 in words is "three million, two hundred fifty-seven thousand, six hundred forty-three".